JPH11173177A - Vehicular slip control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily control an ABS(automatic braking system)/TRC(traction control system), and also to bring stable driving force into full play by controlling an injector in each cylinder and lowering the output power of an engine at a time when a wheel spin is detected in each individual driving wheel. SOLUTION: During the running of a vehicle, a traction controller 12 converts those of analog signals such as a signal out of an ABS speed sensor 11, an engine speed signal being generated in an engine control computer 13 and an injector output signal or the like into square wave signals by a waveform shaping circuit 15, inputting them into a microcomputer 19. In the case where rotation in a driving wheel (front wheel) is in an abnormal state, namely, it turns to a wheel spin is detected, the injector output signals to be inputted are thinned out by a CPU 21, and thereby any fuel injection output of an injector 14 is controlled so as to be temporarily stopped in a partial manner, engine output is lowered, for example, as far as 80%. This thinning is executed stepwise and the engine output is gradually lowered whenever the abnormal state is continued.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to traction control for adjusting the rotational driving force of a drive wheel by braking the drive wheel when the tendency of the drive wheel to spin is detected in a vehicle such as an automobile. The present invention relates to control for detecting traction control by detecting the tendency of wheels to spin.

[0002]

2. Description of the Related Art In recent years, automobiles have often been equipped with an anti-skid brake control (ABS) system for adjusting a braking force in order to prevent a braked vehicle from being locked during braking. In order to minimize the power loss of the engine when the wheels are idling and to transmit the driving force of the driving wheels to the road more effectively, the driving force of the driving wheels is adjusted effectively. Traction Control (TRC)
The system is also installed.

[0003] As such an ABS system and a TRC system, there is an ABS / TRC system shown in FIG. The ABS / TRC system includes left and right front wheels 30, 31 which are non-driving wheels, wheel speed sensors 32, 33 for detecting wheel speeds of the left and right front wheels 30, 31, and a modulator 34 for adjusting brake pressure of the front wheels. And the front wheel 30,
Brake actuator 35 for generating braking force on 31
And left and right rear wheels 36 and 37 which are driving wheels, and a wheel speed sensor 3 for detecting wheel speeds of the left and right rear wheels 36 and 37
8 and 39, modulators 40a and 40b for adjusting the brake pressure of the rear wheels 36 and 37, respectively, and the rear wheels 36 and 3
7, brake actuators 41a and 41b for generating a braking force, double check valves 43 and 44 controlled to be opened and closed by a brake pedal 42, and compressed air in an air tank which is opened at the time of traction control to supply left and right rear wheels 36 and 37 to Modulators 40a, 40b
Traction electromagnetic valves 45 and 46, which are electromagnetic valves that respectively feed to the vehicle, a control unit 48 for controlling the wheel speed sensors 32 and 33, the accelerator 47 and the brake 42.

As described above, the four wheel speed sensors 32, 3
ABS with 3, 38, 39 for each of the left, right, front and rear wheels
In the / TRC system, each wheel speed sensor 32, 3
The wheel speed signals from 3, 38, 39 are sent to the control unit 48, and these wheel speed signals are calculated during the braking operation. Based on the calculation result, the modulators 40a, 40b corresponding to the wheels in which the wheels tend to skid, The brake pressure of the brake actuators 41a and 41b is adjusted so that the skid tendency of each wheel is eliminated. As described above, the control unit 48 performs the anti-skid brake control so as to eliminate the wheel lock tendency when the wheel tends to lock during braking.

When the propulsion force of the vehicle is increased at the time of starting the wheels or at the time of rapid acceleration, the ABS / TRC control unit 48 performs calculations based on the wheel speed signals from the respective wheel speed sensors 32, 33, 38 and 39, If the control unit 48 determines that the rear wheels 36, 37, which are the driving wheels, have a tendency to spin, the control unit 48 determines that the rear wheels 36, 3 tend to spin.
The control signals are output to the modulators 40a and 40b and the traction electromagnetic valves 45 and 46 corresponding to. With this control signal, the valve is turned on and opened, and the air tank 4
9, compressed air is supplied from the traction electromagnetic valves 45, 46,
Double check valves 43 and 44 and modulator 40
a, 40b through the brake actuators 41a, 4b
1b, and the rear wheels 36 and 37 which are liable to spin are braked. By braking the rear wheels 36, 37, the rear wheels 36, 37
The rotational driving force of the wheel 37 is suppressed, and as a result, the tendency of the rear wheels 36 and 37, which have a tendency to spin, to slip is eliminated.

[0006]

However, in the ABS / TRC system described above, when the accelerator is suddenly depressed during normal driving on a slippery road surface, the rear wheels tend to idle, so that the drive wheels are not driven. On the other hand, the TRC by the brake is performed accurately, but the road surface on one side of the left and right wheels has a low friction coefficient or the like, and only the rear wheels are AB.
When the accelerator is suddenly depressed while the vehicle is in the middle of S, the rear wheels on one side on the left and right sides may spin largely and the rear wheels on the other side tend to lock. In this case, since the vehicle is in the ABS mode, the wheel speeds of all the wheels are greatly different from each other.
S is continued and TRC cannot be entered.

[0007] Therefore, in a vehicle equipped with an ABS / TRC system, there is a problem to be solved in controlling the driving wheels while driving the ABS and TRC.

[0008]

According to the present invention, there is provided a slip control device for a vehicle, comprising: an anti-skid control device having an ABS speed sensor for detecting wheel spin of each drive wheel in conjunction with an accelerator pedal. And a traction control means for controlling a driving force of a driving wheel in a wheel spin state based on a signal from the ABS speed sensor, wherein the traction control means comprises: When the wheel spin is detected, the injectors of the plurality of cylinders are controlled to reduce the output of the engine.

[0009] The traction control means may maintain the reduced engine output until the driving force of the driving wheel that is spinning the wheel is obtained; the traction control means may control the injector of each of the cylinders. This is a slip control device for a vehicle in which the engine output is changed in a stepwise manner.

Further, anti-skid control means having an ABS speed sensor for detecting wheel spin of each driving wheel in conjunction with an accelerator pedal, and driving of the driving wheel in a wheel spin state based on a signal from the ABS speed sensor A traction control means for controlling a force, wherein the traction control means keeps the rotation of the engine at an arbitrary speed even when the accelerator pedal is fully opened at the time of start from the vehicle stop state. That is what we did.

Further, anti-skid control means having an ABS speed sensor for detecting wheel spin of each driving wheel in conjunction with an accelerator pedal, and driving of the driving wheel in a wheel spin state based on a signal from the ABS speed sensor Traction control means for controlling the force, the traction control means, in the shift chain mechanism of the manual transmission, when the accelerator pedal is fully opened during running, when the clutch pedal is depressed, the engine That is, the rotation is fixed to an arbitrary number of rotations.

In the vehicle slip control device having such a configuration, the output of the engine is controlled when the ABS / TRC control is being performed, and the driving force of the drive wheels themselves is limited to control the ABS / TRC. Control can be performed.
Therefore, the ABS / TRC can be easily controlled, braking can be appropriately performed corresponding to the wheel spin of the driving wheels, and a stable driving force can be supplied.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a vehicle slip control device according to the present invention.

As shown in FIG. 1, a vehicle slip control device according to a first embodiment of the present invention is a front wheel (A, B) or a rear wheel (A) which is a driving wheel of a vehicle 10 in conjunction with an accelerator pedal. Anti-skid control means including an ABS speed sensor 11 for detecting a rotation speed of each drive wheel of C and D);
A traction controller 12 which is a configuration of traction control means for controlling a signal from the ABS speed sensor 11 and an injector of the engine; an engine control computer 13 which is a configuration of traction control means for controlling an injector of the engine; And an injector 14 provided for each of the above. It is needless to say that the number of cylinders is not limited to four and is not limited to four.

As shown in FIG. 2, the traction controller 12 has a waveform shaping circuit 15 for converting an analog signal composed of a signal from the ABS speed sensor 11, a signal of the engine speed, an injector output signal and the like into a predetermined rectangular wave signal. , An input circuit 17 for inputting a signal from the rotary switch 16, an output circuit 18 for outputting to the injector 14, a waveform shaping circuit 15, an input circuit 17, and an output circuit 1.
And a microcomputer 19 for controlling the microcomputer 8. This microcomputer 19 has a RAM
A memory 20 composed of a ROM and a CPU 21 for performing arithmetic processing
And an I / O 22 for controlling input and output.

Engine control computer 13
Generates an injector output signal for driving the four-cylinder injector 14 based on the engine speed. This signal is input to the waveform shaping circuit 15 of the traction controller 12 to generate a square wave signal. . The engine control computer 13 performs injection so that when the wheel speed of each driving wheel is detected by the ABS speed sensor 11 of the driving wheel (A and B or C and D), the wheel spin disappears and the driving force is exerted. The output signal is decimated to reduce the output of the engine. The details will be described below.

The rectangular wave signal detected and shaped by the ABS speed sensor 11 is, for example, provided that the front wheels (A, B) are rotating normally, as shown in FIG. Is the square wave signal generated by A = B
At the same timing. Front wheels (A, B)
In the case of an abnormality in which the rotational speeds of the front wheels (A, B) are different due to occurrence of slip or the like, that is, as shown in FIG. 4B, the front wheels (A) are early and the front wheels (B) are slow, , The on-time of the rectangular wave signal of the front wheel (B) becomes longer. This state is detected by the microcomputer 19 of the traction controller 12 and instructed to the engine control computer 13.

The engine control computer 13 controls the injector output signal by obtaining the engine speed. As shown in FIG. 5, the front wheels (A, B) and the rear wheels (C, When the state of D) is normal, the output signal to each injector 14 is 10
It is 0%.

For example, when the driving wheels are the front wheels (A, B) and the rotation is abnormal, that is, when the wheel spins, the traction controller 12 controls the engine control computer as shown in FIG. The output signal of 80% is generated and output by controlling so as to thin out the injector output signal generated in 13. In the embodiment, the thinning of the injection output signal is reduced stepwise (100%, 95%, 90%...).

If this abnormal state continues, the output signal of the injector is controlled to be further thinned out, and a further reduced 60% output signal is generated and output.

In this manner, the rotation state of the tires of the front wheels (A, B) or the rear wheels (C, D) is detected, and the wheel spin is applied to each of the unbalanced driving wheels such as slip. Occurs, the fuel injection output of the injector 14 is partially stopped. For example, the output of the engine (front wheels (A,
The wheel spin of the tire of B) or the rear wheels (C, D) can be eliminated.

Next, a vehicle slip control device according to a second embodiment will be described. The vehicle slip control device according to the second embodiment includes an anti-skid control unit including an ABS speed sensor 11 for detecting wheel spin of each drive wheel in conjunction with an accelerator pedal, and a signal from the ABS speed sensor 11. Traction control means for controlling the driving force of the driving wheels in the wheel spin state,
The traction control means keeps the rotation of the engine at an arbitrary speed even when the accelerator pedal is fully opened at the time of starting from the vehicle stopped state.

The anti-skid control means and the traction control means are the same as those in the first embodiment shown in FIGS.

The above-mentioned traction means can avoid a sudden start that occurs when the accelerator pedal is fully opened when the vehicle engine is started and the vehicle is going to start in an idling state, or the accelerator pedal can be stopped after one breath. The speed will depend on how you step. In order to keep the engine at an arbitrary speed at this time, as shown in FIG. 5, the normal injector output signal is gradually increased from 100% to 80%.
% Or 60%.

Next, a vehicle slip control device according to a third embodiment will be described. The vehicle slip control device according to the third embodiment includes an anti-skid control unit including an ABS speed sensor 11 for detecting wheel spin of each drive wheel in conjunction with an accelerator pedal, and a signal from the ABS speed sensor 11. Traction control means for controlling the driving force of the driving wheels in the wheel spin state,
The traction control means is such that in a shift chain mechanism of a manual transmission, when the accelerator pedal is fully opened during running and the clutch pedal is depressed, the engine speed is fixed at an arbitrary speed.

Here, the anti-skid control means and the traction control means are the same as those of the first embodiment shown in FIGS.

When the traction control means depresses the clutch pedal when the accelerator pedal is fully opened during traveling, the load on the engine is stopped at a stretch and the engine is fully opened. Then, vibrations are applied to the entire running vehicle, which adversely affects the driving operation. Therefore, when the accelerator pedal is fully opened during traveling and the clutch is depressed, the rotational state of the engine at that time is maintained, so that the engine can be completely opened. At this time, in order to keep the engine at an arbitrary rotational speed, as shown in FIG. 5, the normal injector output signal is reduced in steps from 100% to 80% or 60%.

[0028]

As described above, the vehicle slip control device according to the present invention controls the driving force of the driving wheel in the slip state based on the signal from the ABS speed sensor that detects the wheel spin of each driving wheel. Traction control means, the traction control means controls the injectors of a plurality of cylinders to reduce the output of the engine when the drive wheels are idling,
It is possible to reduce the driving force of the drive shaft so as to eliminate the slippage of the tire and to provide a stable driving force.

When the accelerator pedal is fully opened when the engine of the vehicle is started and the vehicle is to be started in an idling state, it is possible to avoid sudden start by maintaining the engine rotation at an arbitrary speed. In addition to this, there is an effect that the vehicle can be started with one breath, and safety by sudden start can be secured.

Further, in the case where the transmission of the vehicle is a manual soft change mechanism, if the accelerator pedal is fully opened while the vehicle is running and the clutch is depressed, the rotation state of the engine at that time is maintained, so that the useless emptying is performed. Therefore, there is an effect that it is possible to prevent vibrations that affect the entire vehicle due to the above and to prevent a bad influence on the driving operation.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an entire ABS sensor and a traction controller according to the present invention.

FIG. 2 is a schematic explanatory view showing the inside of the traction controller.

FIG. 3 is an explanatory diagram showing functions of a waveform shaping circuit included in the traction controller.

4A and 4B are explanatory diagrams showing output waveforms of the ABS speed sensor. FIG. 4A is a rectangular wave signal showing a normal state of the front wheels (A, B), and FIG. 4B is a diagram showing an abnormal front wheel ( A, B)
Of FIG.

FIG. 5 shows an injector output signal output from the engine control computer.
(A) is a normal 100% output, (B) is an 80% output,
(C) shows a 60% output signal.

FIG. 6 is a block diagram showing the entire ABS control and traction control in the vehicle.

[Explanation of symbols]

10; vehicle, 11; ABS speed sensor, 12; traction controller, 13; engine control computer, 14; injector, 15; waveform shaping circuit, 16; rotary S / W, 17; input circuit, 18;
Output circuit, 19; microcomputer, 20; memory, 21; CPU, 22; I / O

Claims (5)

[Claims] An anti-skid control means including an ABS speed sensor for detecting wheel spin of each driving wheel in conjunction with an accelerator pedal, and driving of a driving wheel in a wheel spin state based on a signal from the ABS speed sensor. A traction control means for controlling a force, wherein the traction control means controls each injector of a plurality of cylinders when detecting wheel spin of each drive wheel. A slip control device for a vehicle, wherein an output of an engine is reduced. 2. The vehicle slip control device according to claim 1, wherein the traction control means maintains the reduced engine output until the driving force of the driving wheel that is spinning the wheel is obtained. 3. The vehicle slip control device according to claim 1, wherein said traction control means controls an injector of each of the cylinders in a stepwise manner to change an engine output. 4. An anti-skid control means having an ABS speed sensor for detecting wheel spin of each driving wheel in conjunction with an accelerator pedal, and driving of a driving wheel in a wheel spin state based on a signal from said ABS speed sensor. A traction control means for controlling a force, wherein the traction control means keeps the rotation of the engine at an arbitrary speed even when the accelerator pedal is fully opened at the time of start from the vehicle stop state. The slip control device for a vehicle according to claim 1, wherein: 5. An anti-skid control means having an ABS speed sensor for detecting wheel spin of each driving wheel in conjunction with an accelerator pedal, and driving of a driving wheel in a wheel spin state based on a signal from said ABS speed sensor. A traction control means for controlling the force, the traction control means, in the shift chain mechanism of the manual transmission, when the accelerator pedal is fully open during traveling,
A slip control device for a vehicle, wherein when a clutch pedal is depressed, the engine speed is fixed at an arbitrary speed.